Gold Coast Titans have sacked former captain Kevin Proctor after the 33-year-old posted a video of himself appearing to vape at half-time during his side's NRL loss to Canterbury-Bankstown Bulldogs.

The Queensland outfit were downed 36-26 at CommBank Stadium by the Bulldogs on Sunday to keep them marooned joint-bottom of the ladder with Wests Tigers after a miserable season.

Ex-skipper Proctor - who was a non-playing member of the matchday squad as 19th man - appeared to be seen inhaling from a vape pen during the interval in a since-deleted video posted to Instagram, with the Titans trailing 26-10.

Both vaping and the use of mobile phones in dressing rooms are a breach of stadium and sport integrity rules, and Gold Coast have now opted to dismiss the second-rower out of hand, with a $15,000 fine to boot.

Proctor, a former Kiwi Test veteran and an NRL Premiership winner in 2012 with Melbourne, was a flagship purchase for the Titans when he arrived for the 2017, and held the armband until the end of last term.

His dismissal may spell the end of his first-grade career in Australia, with several sides already juggling tight salary cap restrictions.